US11057923B2 - Transmission method, terminal device and base station - Google Patents

Transmission method, terminal device and base station Download PDF

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Publication number
US11057923B2
US11057923B2 US16/611,202 US201816611202A US11057923B2 US 11057923 B2 US11057923 B2 US 11057923B2 US 201816611202 A US201816611202 A US 201816611202A US 11057923 B2 US11057923 B2 US 11057923B2
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indicator field
cbg
control channel
downlink control
terminal device
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US20200170033A1 (en
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Xuejuan Gao
Ekpenyong TONY
Fang-Chen Cheng
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Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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    • H04W72/1289—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols

Definitions

  • This application relates to the field of communications technologies, and in particular, to a transmission method, a terminal device, and a base station.
  • a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH) are respectively configured to bear downlink data transmission and uplink data transmission.
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • TB transport block
  • a PDSCH/PUSCH may support transmission of one or two TBs.
  • the downlink data transmission is used as an example.
  • ACK/NACK feedback is performed based on the TB.
  • each TB corresponds to 1-bit ACK/NACK feedback information which is configured to indicate whether the TB is received correctly.
  • a PDSCH is configured with transmission of a plurality of TBs, and spatial combination is used, logical and operation needs to be performed on ACK/NACK feedback information corresponding to each TB born by a PDSCH, to obtain 1-bit ACK/NACK feedback information. Uplink data transmission is similar to this.
  • a TB needs to be divided into K code blocks (CBs). Coding and cyclic redundancy check (CRC) addition is performed on each CB separately.
  • CRC cyclic redundancy check
  • a plurality of encoded CBs are concatenated together for mapping and transmission.
  • Each CB is independently encoded and includes CRC. Therefore, actually, each CB may generate ACK/NACK feedback information.
  • ACK/NACK feedback is performed for each CB, one TB needs to correspond to K-bit ACK/NACK feedback information, and the feedback quantity is relatively great.
  • ACK/NACK feedback is performed only for the TB.
  • a TB is correctly received only when all CBs in the TB are received correctly.
  • the terminal may feed back ACK as feedback information. Once a CB in the TB is received incorrectly, feedback information of the TB is NACK, and a base station side needs to retransmit the TB.
  • a 5G system supports more diversified and complex data transmission.
  • a mechanism is needed to improve transmission efficiency of the system, but the foregoing TB-based transmission and ACK/NACK feedback mechanism that is applied to the LTE system is not applicable to the 5G NR system any more.
  • Embodiments of this application provide a transmission method, a terminal device, and a base station, to resolve a technical problem that there is no CBG-based method for performing retransmission and ACK/NACK feedback in the related art.
  • an embodiment of this application provides a transmission method, applied to a terminal device.
  • the transmission method includes: receiving, by the terminal device, a downlink control channel; and obtaining, by the terminal device, a first indicator field from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the method further includes: determining, by the terminal device, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the determining, by the terminal device, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid includes: when it is determined that the downlink control channel is to schedule a retransmission, determining that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, determining that the downlink control channel does not include the first indicator field or the first indicator field is invalid, or the downlink control channel is to schedule a retransmission and/or an initial transmission of the M CBGs; or determining, by the terminal device according to a second indicator field in the downlink control channel, whether the first indicator field exists, or whether the first indicator field is valid, where the second indicator field indicates whether the first indicator field exists or whether the first indicator field is valid; or determining, by the terminal device according to a third indicator field in the downlink control channel, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid, the third indicator field indicates whether the terminal device supports C
  • the terminal device when the terminal device determines, based on the first indicator field, that all CBGs are newly transmitted, the terminal device reports a NDI toggled state to a MAC layer; or when the terminal device determines, based on the first indicator field, that at least one CBG is retransmitted, the terminal device reports a NDI un-toggled state to the MAC layer.
  • the method before the receiving, by the terminal device, a downlink control channel, the method further includes: receiving a higher layer signal; determining, based on configuration information in the higher layer signal, whether the terminal device supports CBG-based transmission; and when it is determined that the terminal device supports the CBG-based transmission, receiving, by the terminal device, the downlink control channel including the first indicator field.
  • the method further includes: generating, by the terminal device, M*K-bit ACK/NACK feedback information for each TB, where each K-bit corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBGs in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and when part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, generating NACK as place holding information for a location of an un-retransmitted CBG; or generating, by the terminal device, N*K-bit ACK/NACK feedback information, where each K-bit corresponds to
  • an embodiment of this application provides a terminal device, to which the foregoing transmission method is applicable.
  • the terminal device includes: a first receiving device, configured to receive a downlink control channel; and an obtaining device, configured to obtain a first indicator field from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the terminal device further includes: a first determining device, configured to, before the first indicator field is obtained from the downlink control channel, determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • a first determining device configured to, before the first indicator field is obtained from the downlink control channel, determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the first determining device is specifically configured to: when it is determined that the downlink control channel is to schedule a retransmission, determine that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, determine that the downlink control channel does not include the first indicator field or the first indicator field is invalid; or determine, based on a second indicator field, whether the first indicator field exists, or indicate whether the first indicator field is valid, where the second indicator field indicates whether the first indicator field exists or whether the first indicator field is valid; or determine, according to a third indicator field in the downlink control channel, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid, where the third indicator field indicates whether the terminal device supports CBG-based transmission, when the third indicator field indicates that the terminal device supports the CBG-based transmission, determine that the downlink control channel includes the first indicator field or the first indicator field is valid; when the third indicator field indicates that the terminal device does not support the CBG-based transmission,
  • the terminal device further includes: a first reporting device, configured to report a NDI toggled state to a MAC layer when the terminal device determines, based on the first indicator field, that all CBGs are newly transmitted; and a second reporting device, configured to report a NDI un-toggled state to the MAC layer when the terminal device determines, based on the first indicator field, that at least one CBG is retransmitted.
  • a first reporting device configured to report a NDI toggled state to a MAC layer when the terminal device determines, based on the first indicator field, that all CBGs are newly transmitted
  • a second reporting device configured to report a NDI un-toggled state to the MAC layer when the terminal device determines, based on the first indicator field, that at least one CBG is retransmitted.
  • the terminal device further includes: a second receiving device, configured to receive a higher layer signal before the terminal device receives a downlink control channel; a second determining device, configured to determine, based on configuration information in the higher layer signal, whether the terminal device supports the CBG-based transmission; and a third receiving device, configured to, when it is determined that the terminal device supports the CBG-based transmission, receive, by the terminal device, the downlink control channel including the first indicator field.
  • a second receiving device configured to receive a higher layer signal before the terminal device receives a downlink control channel
  • a second determining device configured to determine, based on configuration information in the higher layer signal, whether the terminal device supports the CBG-based transmission
  • a third receiving device configured to, when it is determined that the terminal device supports the CBG-based transmission, receive, by the terminal device, the downlink control channel including the first indicator field.
  • the terminal device further includes: a feedback device configured to: when the terminal device performs ACK/NACK feedback for a CBG scheduled by the downlink control channel, generate M*K-bit ACK/NACK feedback information for each TB, where each K-bit corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBGs in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and when part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, generate NACK as place holding information for a location of an un-retransmitted CBG; or generate N*K-bit ACK/NACK feedback information, where each K-bit corresponds to one CBG, N is
  • an embodiment of this application further provides a transmission method, applied to a base station.
  • the transmission method includes: sending, by the base station, a downlink control channel, where the downlink control channel includes a first indicator field, and the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the method before the sending, by the base station, the downlink control channel, the method further includes: determining, by the base station, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • determining, by the base station, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid specifically includes: when it is determined that the downlink control channel is to schedule a retransmission, determining that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, determining that the downlink control channel does not include the first indicator field or the first indicator field is invalid; or determining whether the downlink control channel includes the first indicator field or whether the first indicator field is valid, and setting a second indicator field in the downlink control channel, where the second indicator field indicates whether the first indicator field exists or whether the first indicator field is valid; or determining whether a terminal device supports CBG-based transmission, and setting a third indicator field in the downlink control channel, where the third indicator field indicates whether the terminal device supports the CBG-based transmission; and when the third indicator field indicates that the terminal device supports the CBG-based transmission, determining that the downlink control channel includes the first indicator field or the first
  • the method before the sending, by the base station, the downlink control channel, the method further includes: sending a higher layer signal, where the higher layer signal indicates whether the terminal device supports the CBG-based transmission; and when it is determined that the terminal device supports the CBG-based transmission, sending, by the base station, the downlink control channel including the first indicator field.
  • the method when receiving ACK/NACK feedback performed by a terminal device for a CBG scheduled by the downlink control channel, the method further includes: determining, by the base station, that the terminal device generates M*K-bit ACK/NACK feedback information for each TB, where each K-bit corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBGs in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, generating NACK as place holding information for a location of an un-retransmitted CBG; or determining, by the base station, that the terminal device generates N*K-bit ACK/
  • an embodiment of this application further provides a base station, to which the foregoing transmission method in the third aspect is applicable.
  • the base station includes: a transmitting device, configured to send a downlink control channel, where the downlink control channel includes a first indicator field, and the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the base station further includes: a first determining device, configured to, before the base station sends the downlink control channel, determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • a first determining device configured to, before the base station sends the downlink control channel, determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the first determining device is further configured to: when it is determined that the downlink control channel is to schedule retransmission, determine that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, determine that the downlink control channel does not include the first indicator field or the first indicator field is invalid; or determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid, and set a second indicator field in the downlink control channel, where the second indicator field indicates whether the first indicator field exists or indicate whether the first indicator field is valid; or determine whether the terminal device supports the CBG-based transmission, and set a third indicator field in the downlink control channel, where the third indicator field indicates whether the terminal device supports the CBG-based transmission; and when the third indicator field indicates that the terminal device supports the CBG-based transmission, determine that the downlink control channel includes the first indicator field or the first indicator field is valid; when the third indicator field indicates that the terminal device does not support the CBG-based transmission, determine
  • the transmitting device is further configured to: send a higher layer signal before the base station sends the downlink control channel, where the higher layer signal indicates whether a terminal device supports the CBG-based transmission; and when it is determined that the terminal device supports the CBG-based transmission, send, by the base station, the downlink control channel including the first indicator field.
  • the base station further includes: a second determining device configured to: when receiving ACK/NACK feedback performed by the terminal device for a CBG scheduled by the downlink control channel, determine that the terminal device generates M*K-bit ACK/NACK feedback information for each TB, where each K-bit corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBGs in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and if part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, generate NACK as place holding information for a location of an un-retransmitted CBG; or determine that the terminal device generates N*K-bit ACK/NACK feedback information
  • Embodiment 5 of this application provides a computer apparatus.
  • the apparatus includes a processor.
  • the processor is configured to execute a computer program stored in a memory, to implement the operations in the method according to Embodiment 1 and Embodiment 3.
  • Embodiment 6 of this application provides a computer readable storage medium, storing a computer program.
  • the computer program is executed by a processor, the operations in the method according to Embodiment 1 and Embodiment 3 are implemented.
  • Embodiment 7 of this application provides a transmission apparatus, including: a memory, configured to store a program instruction; and a processor configured to invoke the program instruction stored in the memory, and perform the following operations according to the obtained program instruction: receiving a downlink control channel; and obtaining a first indicator field from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • a transmission apparatus including: a memory, configured to store a program instruction; and a processor configured to invoke the program instruction stored in the memory, and perform the following operations according to the obtained program instruction: receiving a downlink control channel; and obtaining a first indicator field from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • Embodiment 8 of this application provides a transmission apparatus, including: a memory, configured to store a program instruction; and a processor, configured to invoke the program instruction stored in the memory, and perform the following operation according to the obtained program instruction: sending a downlink control channel, where the downlink control channel includes a first indicator field, and the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • a transmission apparatus including: a memory, configured to store a program instruction; and a processor, configured to invoke the program instruction stored in the memory, and perform the following operation according to the obtained program instruction: sending a downlink control channel, where the downlink control channel includes a first indicator field, and the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • a terminal device receives a downlink control channel, and then obtains a first indicator field from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted, to resolve a technical problem that no method supporting CBG-based retransmission and ACK/NACK feedback is available in the related art, and achieve a technical effect of improving transmission performance.
  • CBG code block group
  • FIG. 1 is a schematic flowchart of a transmission method applied to a terminal device according to an embodiment of this application.
  • FIG. 2 is a schematic diagram of first indicator fields corresponding to each TB that may be adjacent to be used as one indicator field according to an embodiment of this application.
  • FIG. 3 is a schematic diagram of first indicator fields corresponding to each TB that may be used as two indicator fields respectively according to an embodiment of this application.
  • FIG. 4 is a schematic diagram of devices in a terminal device according to an embodiment of this application.
  • FIG. 5 is a schematic structural diagram of a terminal-side transmission apparatus according to an embodiment of this application.
  • FIG. 6 is a schematic structural diagram of a network-side transmission apparatus according to an embodiment of this application.
  • CBG code block group
  • the K number of CBs may be divided into a plurality of CBGs in a preset rule, and each CBG may include one CB, or may include K number of CBs (namely, a TB).
  • a terminal device may feed back NACK information on CBG transmission, while a base station may consider the NACK as ACK; or the terminal device may feed back ACK information on CBG transmission, while a base station may consider the ACK as NACK. Therefore, the terminal device and the base station have inconsistent understandings of a retransmitted CBG, which causes inaccurate combination of hybrid automatic repeat requests (HARQ).
  • HARQ hybrid automatic repeat requests
  • a transmission method in the embodiments of this application may be applied to a terminal device.
  • the terminal device may be a user equipment (UE) such as a mobile phone and a computer, etc.
  • UE user equipment
  • a specific type of the terminal device is not specifically limited in this application.
  • the transmission method in the embodiments of this application may, but not limited to, be applied to a 5G NR system.
  • the method is also applicable to another system, such as an LTE system.
  • terms “first”, “second”, “third”, and the like in the embodiments of this application are merely used for distinguishing, but not for any limitation.
  • an embodiment of this application provides a transmission method, applied to a terminal device.
  • a process of the transmission method may be described as follows.
  • the terminal device receives a downlink control channel.
  • the terminal device obtains a first indicator field from the downlink control channel.
  • the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field may be used to indicate CBGs that are of CBGs into which a TB is divided in an initial transmission and that are included in a shared channel scheduled by the downlink control channel for retransmission.
  • the transmission method in the embodiments of this application further includes: the terminal device determines that whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the first indicator field is valid means that the terminal device needs to read the first indicator field and then perform a corresponding operation based on indication of the first indicator field.
  • the first indicator field is invalid means that the downlink control channel has the first indicator field, but the first indicator field does not have any indication function. In this case, when the terminal device receives the downlink control channel, it may be consumed that the downlink control channel includes an M-bit indicator field or A*M-bit first indicator field. However, no attention is paid to specific content of the first indicator field, and a bit status of this part of an indication may not be parsed.
  • the downlink control channel when the downlink control channel is to schedule retransmission, the downlink control channel includes a first indicator field; and when the downlink control channel is to schedule an initial transmission, the downlink control channel does not include the first indicator field.
  • the terminal device may use different downlink control information (DCI) formats for a downlink control channel configured to schedule retransmission and a downlink control channel configured to schedule an initial transmission.
  • DCI downlink control information
  • the terminal device may determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid in, but not limited to, the following manners.
  • Manner 1 When it is determined that the downlink control channel is to schedule retransmission, it is determined that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, it is determined that the downlink control channel does not include the first indicator field or the first indicator field is invalid.
  • a HARQ process number indicated in the downlink control channel is the same as a HARQ process number corresponding to a TB that has been received by the terminal device, and retransmission is determined based on another indicator field, for example, a new data indication (NDI), an indicator field that may indicate whether the downlink control channel corresponds to retransmission, or the like.
  • NDI new data indication
  • RNTI radio network temporary identities
  • Manner 2 when the downlink control channel includes a second indicator field where the second indicator field indicates whether the first indicator field exists or indicate whether the first indicator field is valid, based on the second indicator field, the terminal device determines whether the first indicator field exists or indicates whether the first indicator field is valid.
  • Manner 3 When the downlink control channel includes a third indicator field where the third indicator field indicates whether the terminal device supports the CBG-based transmission, it is determined that the first indicator field is included or the first indicator field is valid when the third indicator field indicates that the terminal device supports the CBG-based transmission; it is determined that the first indicator field is not included or the first indicator field is invalid, when the third indicator field indicates that the terminal device does not support the CBG-based transmission.
  • Manner 4 A higher layer signal is received, based on configuration information in the higher layer signal, whether the terminal device supports the CBG-based transmission is determined, and if it is determined that the terminal device supports the CBG-based transmission, it is determined that the first indicator field is included or the first indicator field is valid; if it is determined that the terminal device does not support the CBG-based transmission, it is determined that the first indicator field is not included or the first indicator field is invalid.
  • the terminal device may not determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid. Regardless of whether the downlink control channel is to schedule an initial transmission or a retransmission, the terminal device determines that the downlink control channel always includes the first indicator field, that is, a downlink control channel configured to schedule the retransmission and a downlink control channel configured to schedule the initial transmission use a same DCI format.
  • the transmission method in the embodiments of this application further includes: a higher layer signal is received; based on configuration information in the higher layer signal, whether the terminal device supports the CBG-based transmission is determined; if it is determined that the terminal device supports the CBG-based transmission, the terminal device receives the downlink control channel including the first indicator field.
  • the terminal device before receiving the downlink control channel including the first indicator field, may receive the higher layer signal. Then, the terminal device may determine, based on configuration of the higher layer signal, whether the CBG-based retransmission is supported. When determining that the CBG-based retransmission is supported, the terminal device receives the downlink control channel; or when determining that the CBG-based retransmission is not supported, the terminal device may receive a downlink control channel based on a size of a DCI that does not include the first indicator field, or may receive a downlink control channel based on a size of a DCI that includes the first indicator field.
  • the first indicator field may be configured to indicate whether each CBG of corresponding CBGs in an initial transmission of a TB needs to be retransmitted.
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the first indicator field has M bits; or if the current transmission includes A number of TBs, the first indicator field has A*M bits.
  • first indicator fields corresponding to each TB may be adjacent to be used as one indicator field; or as shown in FIG. 3 , when the current transmission includes a plurality of TBs, first indicator fields corresponding to each TB may alternatively be separate, and be respectively used as two first indicator fields.
  • FIG. 2 when the current transmission includes a plurality of TBs, first indicator fields corresponding to each TB may be adjacent to be used as one indicator field; or as shown in FIG. 3 , when the current transmission includes a plurality of TBs, first indicator fields corresponding to each TB may alternatively be separate, and be respectively used as two first indicator fields.
  • first indicator fields corresponding to each TB may alternatively be separate, and be used at two first indicator fields respectively.
  • a specific manner may be determined according to actual conditions, and is not specifically in this embodiment of this application.
  • a 1-bit first indicator field corresponding to a CBG when information about a 1-bit first indicator field corresponding to a CBG is “0”, it indicates an initial transmission or indicates that a retransmission is not needed; or when information about a 1-bit first indicator field corresponding to a CBG is “1”, it indicates a retransmission or indicates that a transmission is needed this time. If all the M bits are “0”, it indicates an initial transmission of a new TB, that is, all CBGs are newly transmitted. If all the M bits are “1”, it indicates a retransmission of an original TB, that is, all CBGs of the TB need to be retransmitted. Conversely, “1” represents an initial transmission, and “0” represents a retransmission.
  • the method may further include: by the terminal device, M*K-bit ACK/NACK feedback information for each TB is generated, where each K-bit information corresponds to one CBG, and K-bit ACK/NACK feedback information corresponding to each CBG is arranged in a sequence of a corresponding CBG in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and if retransmission scheduled by the downlink control channel is retransmission of some of CBGs corresponding to an initial transmission of a TB, NACK as place holding information for a location of an un-retransmitted CBG is generated; or, by the terminal device, N*K-bit ACK/NACK feedback information is generated, where each K-
  • one TB is divided into four CBGs.
  • the terminal device receives the four CBGs, and generates 1-bit ACK/NACK feedback information for each CBG according to a receiving condition, where the 1-bit ACK/NACK feedback information is obtained after logical and operation is performed on ACK/NACK feedback information of each CB included in the CBGs.
  • 4-bit ACK/NACK feedback information in total is obtained, and may be, for example, ACK, NACK, NACK, and ACK.
  • the feedback information is fed back to the base station.
  • the base station may determine that a second CBG and a third CBG of the TB need to be retransmitted, and send a downlink control channel to the terminal device. Assuming that “1” represents retransmission, and “0” represents an initial transmission, the first indicator field in the downlink control channel is “0110”.
  • the terminal device After receiving the downlink control channel, the terminal device further receives CBG2 and CBG3 that correspond to the first indicator field “0110” and that are in retransmission of a shared channel. Then, the terminal device generates ACK/NACK feedback information for a retransmitted CBG based on a receiving condition.
  • the feedback information may be ACK, ACK, or the like.
  • the terminal may generate 4-bit ACK/NACK all the time when reporting ACK/NACK, and generate NACK as place holding information for CBG1 and CBG4 that are determined, based on the first indicator field, not to be retransmitted.
  • the 4-bit ACK/NACK feedback information reported by the terminal may be ordered in, but not limited to, the following manners.
  • Manner 1 Feedback information corresponding to an actually received retransmitted CBG may be ordered ahead, and place holding NACK is added behind for supplementation.
  • feedback information may be ACK, ACK, NACK, and NACK.
  • the feedback information corresponding to the actually received retransmitted CBG may be ordered behind, and the place holding NACK is added ahead for supplementation.
  • the feedback information may be NACK, NACK, ACK, and ACK.
  • Ranking may alternatively be performed according to numbers of the CBGs obtained through dividing in the initial transmission of the TB.
  • the CBGs obtained through dividing in the initial transmission of the TB are CBG1, CBG2, CBG3, and CBG4.
  • ACK/NACK of retransmitted CBG2 and CBG3 are ordered in the middle, 1-bit NACK is added ahead CBG2 to be used as feedback information of CBG1, and 1-bit NACK is added behind CBG3 to be used as feedback information of CBG2, that is, the 4-bit ACK/NACK feedback information may be NACK, ACK, ACK, and NACK.
  • the base station can correctly recognize feedback information of a retransmitted CBG that is fed back by the terminal device, provided that the terminal device and the base station pre-agree on a ranking manner.
  • the ACK/NACK feedback information reported by the terminal may not be ordered.
  • the terminal device when reporting ACK/NACK, the terminal device performs reporting only for a retransmitted CBG, that is, only generates 2-bit ACK/NACK feedback information for reporting.
  • the feedback information is ACK, and ACK.
  • the base station may also determine that the terminal device only feeds back 2-bit ACK/NACK, thereby correctly receiving the ACK/NACK. Because the terminal device performs reporting only for a retransmitted CBG, a technical effect of reducing a quantity of feedback information is achieved.
  • the terminal device when the terminal device determines, based on the first indicator field, that all CBGs are all newly transmitted, the terminal device reports a NDI un-toggled state to a media access control (Media Access Control, MAC) layer; or when the terminal device determines, based on the first indicator field, that at least one CBG is retransmitted, the terminal device reports a NDI toggled state to the MAC layer.
  • Media Access Control Media Access Control
  • the terminal device When the terminal device determines, based on the first indicator field, that all CBGs are all newly transmitted, the terminal device reports a NDI toggled (toggled) state to the MAC layer, indicating that the downlink control channel schedules the initial transmission, that is, the initial transmission indicating that previous TB transmission is correct; or when the terminal device determines, based on the first indicator field, that at least one CBG is retransmitted, the terminal device reports a NDI un-toggled (not toggled) state to the MAC layer, indicating that the downlink control channel schedules retransmission, that is, at least one CBG of a previous TB needs to be retransmitted.
  • CBG-based transmission it may be determined, based on indicator fields of a plurality of CBGs, whether to perform retransmission or new transmission. Then, a NDI state corresponding to retransmission or new transmission is reported to a higher layer.
  • the terminal device may receive, based on the first indicator field, a shared channel corresponding to the downlink control channel.
  • the downlink control channel may include a first indicator field, and bits of the first indicator field are all “0”, an initial transmission of a TB may be represented. In this case, the TB does not need to be combined with a TB stored in a buffer. If the downlink control channel includes a first indicator field, and any bit of the first indicator field is “1”, it indicates that a previous TB needs to be retransmitted, that is, one or more CBGs in a TB corresponding to a HARQ process number indicated by the downlink control channel need to be retransmitted. Then, the terminal receives a corresponding shared channel based on the downlink control channel, and combines received retransmitted CBGs of the TB with corresponding CBG information stored in the buffer.
  • the terminal device may send, based on the first indicator field, a shared channel transmission corresponding to the downlink control channel.
  • the downlink control channel may also include first indicator fields.
  • the first indicator fields are all “0”, which represents an initial transmission of a TB; and the terminal device takes a TB from to-be-transmitted data for the initial transmission. In this case, combination is not needed.
  • any bit in the first indicator field is “1”, it represents retransmission, specifically, retransmission of one or more CBGs in a TB corresponding to a HARQ process number indicated by the downlink control channel. Which CBGs in the TB are retransmitted may be indicated by the first indicator field.
  • the terminal device may obtain corresponding CBGs in the TB from the buffer based on the CBGs in the TB that need to be retransmitted under the indication of the first indicator field, and send these to-be-retransmitted CBGs on the shared channel based on scheduling information in the downlink control channel.
  • a base station side After receiving these CBGs, a base station side combines the received retransmitted CBGs in the TB with corresponding CBG information stored in the buffer.
  • a TB is transmitted between the terminal device and the base station is used as an example. It is assumed that “0” represents an initial transmission, and “1” represents a retransmission. If a TB may be regularly divided into four 4 CBGs, a first indicator field may have 4 bits.
  • the terminal device receives a downlink control channel at a slot 1, and schedules the initial transmission of TB1 that is performed in a shared channel transmission.
  • a HARQ process number indicated in the downlink control channel is 0, that is, a HARQ process number corresponding to the TB1 is 0.
  • Four bits of the first indicator field in the downlink control channel are “0000”.
  • the TB1 is divided into four CBGs, namely CBG1, CBG2, CBG3, and CBG4 which are transmitted for the first time.
  • the terminal device After receiving four CBGs in the slot 1, the terminal device generates 1-bit ACK/NACK feedback information for each CBG. For example, if the terminal device receives CBG1, CBG3, and CBG4 correctly, and receives CBG2 incorrectly, the terminal device feeds back ACK, NACK, ACK, and ACK.
  • the base station determines that only CBG2 needs to be retransmitted. For example, retransmission is performed in a slot 3.
  • the base station sends a downlink control channel in the slot 3, sets a first indicator field in the downlink control channel to “0100”, and sets a HARQ process number to 0, to indicate retransmission of TB1 and indicate that only CBG2 is retransmitted.
  • the terminal device receives the downlink control channel in the slot 3, determines, based on the HARQ process number and the first indicator field in the downlink control channel, to perform retransmission for TB1 and that only CBG2 is retransmitted, receives the downlink shared channel in the manner, and combines retransmitted information of CBG2 with information of CBG2 that is received in the previous initial transmission and that is stored in the buffer, to improve demodulation performance.
  • the base station determines that CBG2 and CBG4 need to be retransmitted, for example, retransmitted in the slot 3.
  • the base station sets the first indicator field in the downlink control channel as “0101”, and sets the HARQ process number as 0, to indicate retransmission of TB1 and indicate that CBG2 and CBG4 are retransmitted.
  • the terminal device receives the downlink control channel in the slot 3, determines, based on the HARQ process number and the first indicator field in the downlink control channel, to perform retransmission for TB1 and that CBG2 and CBG4 are retransmitted, receives the downlink shared channel in the manner, and combines retransmitted information of CBG2 and CBG4 with information of CBG2 and CBG4 that is received in the previous initial transmission and that is stored in the buffer, to improve demodulation performance.
  • the terminal device determines, based on the first indicator field in the downlink control channel sent by the base station, which CBG is retransmitted, thereby determining how to combine received data and data in the buffer, avoiding a case that the terminal device and the base station have inconstant understandings of a quantity of retransmitted CBGs and a number, and further avoiding an incorrect buffer combination on a terminal device side.
  • an embodiment of this application further provides a terminal device.
  • the terminal device includes: a first receive device 10 , configured to receive a downlink control channel; and an obtaining device 20 , configured to obtain a first indicator field from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the terminal device further includes: a first determining device, configured to, before the first indicator field is obtained from the downlink control channel, determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • a first determining device configured to, before the first indicator field is obtained from the downlink control channel, determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the first determining device is further configured to: when it is determined that the downlink control channel is to schedule retransmission, determine that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, determine that the downlink control channel does not include the first indicator field or the first indicator field is invalid.
  • the first determining device is further configured to, when the downlink control channel includes a second indicator field where the second indicator field indicates whether the first indicator field exists or whether the first indicator field is valid, determine, based on the second indicator field, whether the first indicator field exists, or indicate whether the first indicator field is valid.
  • the downlink control channel includes a third indicator field where the third indicator field indicates whether the terminal device supports CBG-based transmission
  • the first determining device is further configured to determine, according to the third indicator field, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the third indicator field indicates that the terminal device supports the CBG-based transmission
  • the first determining device is further configured to receive a higher layer signal, and determine, based on configuration information in the higher layer signal, whether the terminal device supports CBG-based transmission, and if it is determined that the terminal device supports the CBG-based transmission, determine that the downlink control channel includes the first indicator field or the first indicator field is valid; when it is determined that the terminal device does not support the CBG-based transmission, determine that the first indicator field is not included or the first indicator field is invalid.
  • the terminal device further includes: a first reporting device, configured to, when the terminal device determines, based on the first indicator field, that all CBGs are newly transmitted, report a NDI un-toggled state to a media access control (MAC) layer; and a second reporting device, configured to report a NDI toggled state to the MAC layer when the terminal device determines, based on the first indicator field, that at least one CBG is retransmitted.
  • a first reporting device configured to, when the terminal device determines, based on the first indicator field, that all CBGs are newly transmitted, report a NDI un-toggled state to a media access control (MAC) layer
  • MAC media access control
  • the terminal device further includes: a second receiving device, configured to receive a higher layer signal before the terminal device receives the downlink control channel; a second determining device, configured to determine, based on configuration information in the higher layer signal, whether the terminal device supports CBG-based transmission; and a third receiving device, configured to, if it is determined that the terminal device supports the CBG-based transmission, receive, by the terminal device, the downlink control channel including the first indicator field.
  • a second receiving device configured to receive a higher layer signal before the terminal device receives the downlink control channel
  • a second determining device configured to determine, based on configuration information in the higher layer signal, whether the terminal device supports CBG-based transmission
  • a third receiving device configured to, if it is determined that the terminal device supports the CBG-based transmission, receive, by the terminal device, the downlink control channel including the first indicator field.
  • the terminal device further includes a feedback device configured to: when the terminal device performs ACK/NACK feedback for a CBG scheduled by the downlink control channel, generate M*K-bit ACK/NACK feedback information for each TB, where each K-bit corresponds to one CBG, and K-bit ACK/NACK feedback information corresponding to each CBG is arranged in a sequence of a corresponding CBG in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and if retransmission scheduled by the downlink control channel is retransmission of some of CBGs corresponding to an initial transmission of a TB, generate NACK as place holding information for a location of an un-retransmitted CBG; or generate N*K-bit ACK/NACK feedback information, where each K-bit information corresponds to one CBG,
  • An embodiment of this application further provides a transmission method applied to a base station.
  • the transmission method includes: a downlink control channel is sent by the base station, where the downlink control channel includes a first indicator field, and the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the method before the sending, by the base station, the downlink control channel, the method further includes: whether the downlink control channel includes the first indicator field or whether the first indicator field is valid is determined by the base station.
  • the determining, by the base station, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid includes: when it is determined that the downlink control channel is to schedule retransmission, it is determined that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, is it determined that the downlink control channel does not include the first indicator field or the first indicator field is invalid; or whether the first indicator field is included or whether the first indicator field is valid is determined, and a second indicator field in the downlink control channel is set, where the second indicator field indicates whether the first indicator field exists or indicate whether the first indicator field is valid; or whether the terminal device supports CBG-based transmission is determined, and a third indicator field in the downlink control channel is set, where the third indicator field indicates whether the terminal device supports the CBG-based transmission; and when the third indicator field indicates that the terminal device supports the CBG-based transmission, it is determined that the first indicator field is included or the first indicator field is valid;
  • the method before the sending, by the base station, the downlink control channel, the method further includes: a higher layer signal is sent, where the higher layer signal indicates whether a terminal device supports the CBG-based transmission; and if it is determined that the terminal device supports the CBG-based transmission, the downlink control channel including the first indicator field is sent by the base station.
  • the method when receiving ACK/NACK feedback performed by the terminal device for a CBG scheduled by the downlink control channel, the method further includes: the base station determines that the terminal device generates M*K-bit ACK/NACK feedback information for each TB, where each K-bit information corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBGs in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and if part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, NACK as place holding information is generated for a location of an un-retransmitted CBG; or the base station determines that the terminal device generates N*K-bit ACK/NACK feedback information
  • An embodiment of this application further provides a base station.
  • the base station includes: a transmitting device, configured to send a downlink control channel, where the downlink control channel includes a first indicator field, and the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the base station further includes: a determining device, configured to, before the base station sends the downlink control channel, determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the determining device is further configured to: when it is determined that the downlink control channel is to schedule retransmission, determine that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, determine that the downlink control channel does not include the first indicator field or the first indicator field is invalid; or determine whether the first indicator field is included or whether the first indicator field is valid, and set a second indicator field in the downlink control channel, where the second indicator field indicates whether the first indicator field exists or whether the first indicator field is valid; or determine whether the terminal device supports CBG-based transmission, and set a third indicator field in the downlink control channel, where the third indicator field indicates whether the terminal device supports the CBG-based transmission; and when the third indicator field indicates that the terminal device supports the CBG-based transmission, determine that the first indicator field is included or the first indicator field is valid; otherwise, determine that the first indicator field is not included or the first indicator field is invalid; or determine whether the terminal device supports the CBG-based transmission
  • the transmit device is further configured to: send a higher layer signal before the base station sends the downlink control channel, where the higher layer signal indicates whether the terminal device supports CBG-based transmission; and if it is determined that the terminal device supports the CBG-based transmission, send, by the base station, the downlink control channel including the first indicator field.
  • the base station further includes a second determining device configured to: when receiving ACK/NACK feedback performed by the terminal device for a CBG scheduled by the downlink control channel, determine that the terminal device generates M*K-bit ACK/NACK feedback information for each TB, where each K-bit information corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBGs in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and if part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, generate NACK as place holding information for a location of an un-retransmitted CBG; or determine that the terminal device generates N*K-bit ACK/NACK feedback information
  • Embodiment 5 of this application provides a computer apparatus.
  • the apparatus includes a processor, where the processor is configured to execute a computer program stored in a memory, to implement the operations in the method according to Embodiment 1 and Embodiment 3 of this application.
  • Embodiment 6 of this application provides a computer readable storage medium, storing a computer program.
  • the computer program is executed by a processor, the operations in the method according to Embodiment 1 and Embodiment 3 of this application is implemented.
  • an embodiment of this application provides a transmission apparatus, for example, may be a terminal device, including: a memory 620 , configured to store a program instruction; and a processor 600 , configured to invoke the program instruction stored in the memory, and perform the following steps according to the obtained program instruction: a downlink control channel is received by using a transceiver 610 ; and a first indicator field is obtained from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the processor 600 is further configured to: determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the determining, by the processor 600 , whether the downlink control channel includes the first indicator field or whether the first indicator field is valid specifically includes: when it is determined that the downlink control channel is to schedule retransmission, it is determined that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, it is determined that the downlink control channel does not include the first indicator field or the first indicator field is invalid; or determining, by the terminal device based on a second indicator field in the downlink control channel, whether the first indicator field exists is determined, or whether the first indicator field is valid is indicated, where the second indicator field indicates whether the first indicator field exists or whether the first indicator field is valid; or determining according to a third indicator field in the downlink control channel, whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the third indicator filed indicates whether the terminal device supports CBG-based transmission.
  • the third indicator field indicates that the terminal device supports the CBG-based transmission, it is determined that the first indicator field is included or the first indicator field is valid; otherwise, it is determined that the first indicator field is not included or the first indicator field is invalid; or a higher layer signal is received, and based on configuration information in the higher layer signal, whether the terminal device supports CBG-based transmission is determined, and if it is determined that the terminal device supports the CBG-based transmission, it is determined that the first indicator field is included or the first indicator field is valid; otherwise, it is determined that the first indicator field is not included or the first indicator field is invalid.
  • the processor 600 determines, based on the first indicator field, that all CBGs are newly transmitted, the processor 600 reports a NDI toggled state to a media access control (MAC) layer by using the transceiver 610 ; or when the processor 600 determines, based on the first indicator field, that at least one CBG is retransmitted, the processor 600 reports a NDI un-toggled state to the MAC layer by using the transceiver 610 .
  • MAC media access control
  • the processor 600 is further configured to: receive a higher layer signal by using the transceiver 610 ; determine, based on configuration information in the higher layer signal, whether the terminal device supports CBG-based transmission; and if it is determined that the terminal device supports the CBG-based transmission, receive the downlink control channel including the first indicator field by using the transceiver 610 .
  • the processor 600 when performing ACK/NACK feedback for a CBG scheduled by the downlink control channel, is further configured to: generate M*K-bit ACK/NACK feedback information for each TB, where each K-bit information corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBGs in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and if part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, generate NACK as place holding information for a location of an un-retransmitted CBG.
  • the processor 600 generates N*K-bit ACK/NACK feedback information, where each K-bit information corresponds to one CBG, N is a quantity of CBGs in transmission scheduled by the downlink control channel, and K is a preset or preconfigured integer that is greater than or equal to 1.
  • the transceiver 610 is configured to receive and send data under the control of the processor 600 .
  • a bus architecture may include any quantity of interconnected buses and bridges that may specifically be linked together through various circuits of one or more processors represented by the processor 600 and a memory represented by the memory 620 .
  • the bus architecture may also link various other circuits such as peripherals, voltage regulators and power management circuits together. These are commonly known in the art. Therefore, further description is not performed in this specification.
  • a bus interface is configured to provide an interface.
  • the transceiver 610 may be a plurality of elements, that is, may include a transmitter and a receiver, to provide a unit configured to communicate with various other apparatuses on a transmission medium.
  • a user interface 630 may alternatively be an interface that can connect with an external required device or an internal required device.
  • the to-be-connected device includes but is not limited to a keypad, a monitor, a speaker, a microphone, a joystick, or the like.
  • the processor 600 is in charge of the bus architecture and usual processing.
  • the memory 620 may store data used when the processor 600 performs an operation.
  • processor 600 may be a central processing unit (CPU), an Application-Specific Integrated Circuit (ASIC), an Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD).
  • CPU central processing unit
  • ASIC Application-Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • CPLD Complex Programmable Logic Device
  • the apparatus may be a base station, including: a memory 520 , configured to store a program instruction; and a processor 500 , configured to invoke the program instruction stored in the memory, and perform the following operation according to the obtained program instruction: a downlink control channel is sent by using a transceiver 510 , where the downlink control channel includes a first indicator field, and the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted.
  • CBG code block group
  • the first indicator field includes A*M-bit indication information, each TB corresponds to M-bit indication information, and each 1-bit in the M-bit information corresponds to one CBG in an initial transmission of a TB, and indicates whether to retransmit the one CBG, where M is a preset or preconfigured quantity of CBGs into which a TB is divided, A is a quantity of TBs included in a shared channel transmission, and M and A are integers greater than or equal to 1.
  • the processor 500 is further configured to: determine whether the downlink control channel includes the first indicator field or whether the first indicator field is valid.
  • the determining, by the processor 500 , whether the downlink control channel includes the first indicator field or whether the first indicator field is valid specifically includes: when it is determined that the downlink control channel is to schedule retransmission, it is determined that the downlink control channel includes the first indicator field or the first indicator field is valid, or when it is determined that the downlink control channel is to schedule an initial transmission, it is determined that the downlink control channel does not include the first indicator field or the first indicator field is invalid; or whether the first indicator field is included or whether the first indicator field is valid is determined, and a second indicator field is set in the downlink control channel, where the second indicator field indicates whether the first indicator field exists or indicate whether the first indicator field is valid; or whether the terminal device supports CBG-based transmission is determined, and a third indicator field is set in the downlink control channel, where the third indicator field indicates whether the terminal device supports the CBG-based transmission; and when the third indicator field indicates that the terminal device supports the CBG-based transmission, it is determined that the first indicator field is included or the first indicator field is
  • the processor 500 is further configured to: send a higher layer signal by using the transceiver 510 , where the higher layer signal indicates whether the terminal device supports the CBG-based transmission.
  • the processor 500 sends the downlink control channel including the first indicator field by using the transceiver 510 .
  • the processor 500 when the processor 500 receives, by using the transceiver 510 , ACK/NACK feedback performed by the terminal device for a CBG scheduled by the downlink control channel, the processor 500 is further configured to: determine that the terminal device generates M*K-bit ACK/NACK feedback information for each TB, where each K-bit information corresponds to one CBG, and K-bit ACK/NACK feedback information of each CBG is arranged in a sequence based on the order of corresponding CBG in an initial transmission of a TB, or in such a manner that feedback information corresponding to an actually received CBG is ordered ahead and place holding feedback information is ordered behind, or in such a manner that feedback information corresponding to an actually received CBG is ordered behind and place holding feedback information is ordered ahead; and if part CBGs corresponding to an initial transmission of a TB are scheduled by the downlink control channel to be retransmitted, generating NACK as place holding information for a location of an un-retransmitted CBG; or determine that the terminal device generates N
  • the transceiver 510 is configured to receive and send data under the control of the processor 500 .
  • a bus architecture may include any quantity of interconnected buses and bridges that may specifically be linked together through various circuits of one or more processors represented by the processor 500 and a memory represented by the memory 520 .
  • the bus architecture may also link various other circuits such as peripherals, voltage regulators and power management circuits together. These are commonly known in the art. Therefore, further description is not performed in this specification.
  • a bus interface is configured to provide an interface.
  • the transceiver 510 may be a plurality of elements, that is, may include a transmitter and a receiver, to provide a unit configured to communicate with various other apparatuses on a transmission medium.
  • the processor 500 is in charge of the bus architecture and usual processing.
  • the memory 520 may store data used when the processor 500 performs an operation.
  • the processor 500 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a complex programmable logic device (CPLD).
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • CPLD complex programmable logic device
  • a terminal device receives a downlink control channel, and then obtains a first indicator field from the downlink control channel, where the first indicator field indicates whether each code block group (CBG) of CBGs in an initial transmission of a TB needs to be retransmitted, to resolve a technical problem that no method supporting CBG-based retransmission and ACK/NACK feedback is available in the related art, and achieve a technical effect of improving transmission performance.
  • CBG code block group
  • this application may be provided as a method, a system, or a computer program product. Therefore, this application may use a form of hardware only embodiments, software only embodiments, or embodiments with a combination of software and hardware. In addition, this application may use a form of a computer program product that is implemented on one or more computer-usable storage media (including but not limited to a disk memory, a CD-ROM, an optical memory, and the like) that include computer-usable program code.
  • a computer-usable storage media including but not limited to a disk memory, a CD-ROM, an optical memory, and the like
  • These computer program instructions may be provided for a general-purpose computer, a special-purpose computer, an embedded processor or a processor of another programmable data processing device to generate a machine, so that the instructions executed by a computer or a processor of the another programmable data processing device generate an apparatus for implementing a specific function in one or more procedures in the flowcharts and/or in one or more blocks in the block diagrams.
  • These computer program instructions may also be stored in a computer readable memory that can instruct the computer or another programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory generate an artifact that includes an instruction apparatus.
  • the instruction apparatus implements a specific function in one or more procedures in the flowcharts and/or in one or more blocks in the block diagrams.
  • These computer program instructions may also be loaded onto a computer or another programmable data processing device, so that a series of operations and steps are performed on the computer or the another programmable device, thereby generating computer-implemented processing. Therefore, the instructions executed on the computer or another programmable device provide steps for implementing a specific function in one or more procedures in the flowcharts and/or in one or more blocks in the block diagrams.

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  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
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CN108809530A (zh) 2018-11-13
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